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Fix #3822: only treat * as a wildchar in like_ filters (#3823)

The PostgreSQL backend passed the value to ILIKE with only `*` turned
into `%`, so `_` and `%` acted as wildcards and `\` as an escape. The
memory backend built a regular expression from the value, so `.`
matched any character and `x(y` raised re.error.

Escape `\`, `%` and `_` for ILIKE, and re.escape the pieces between
the `*` in the memory backend.

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